Linus Michaeli, Jan Saliga, Michal Sakmar, Jan Busa
The paper presents a new approach to ADC histogram test by exponential stimulus signal. The basic, early published, method based on simple exponential stimulus can hide some low code frequency errors in ADC integral nonlinearity. This effect is caused by estimation method of exponential stimulus. The authors proposed new advanced method in processing of histograms achieved by exponential stimulus signal. The basic idea of the new method is in application of periodical exponential stimulus signal consisting of rising and falling parts within its period. Subsequently the estimation of INL is...
XIX IMEKO World Congress
· TC4
· 2009
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Milos Drutarovsky, Jan Saliga, Linus Michaeli, Ingrid Hroncová
The paper presents a remote laboratory system that allows performing experiments controlled across the Internet via web interface as well as locally in the classroom. The system has been developed for courses of advanced digital design and signal processing using complex Field Programmable Gate Array (FPGA) platforms. It allows students full access to laboratory equipments, advanced software licenses, and FPGA platforms remotely using any common web browser and standard remote desktop interface. The system consists of Altera development FPGA kits and suitable instrumentations (Logic...
XIX IMEKO World Congress
· TC1
· 2009
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Andrzej Met, Krzysztof Musiol, Tadeusz Skubis
Application of a switched two-terminal RC networks for the construction of phase-sensitive detectors (PSDs) which are used in self-balancing transformer bridges is described. The switched two-terminal RC network makes possible effective reduction of noise level, increasing the CMRR, removing the input DC offset and providing the galvanic separation of the input and output circuits. Investigation of properties of the precise phase-sensitive detector used in a prototype self-balancing bridge for maintenance of inductance standard shows that the noise attenuation is bigger than 100 dB....
XIX IMEKO World Congress
· TC4
· 2009
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Andreas Voigt, Lars Büttner, Jürgen Czarske, Harald Müller
The precise measurement of the flow rate of natural gas is of vital economical importance since natural gas contributes highly to the total energy mix. In this paper we report about a laser Doppler velocity profile sensor specifically designed to suit the measurement conditions at the optical test facility of the German natural gas flow rate standard. The profile sensor is an extension of the principle of a laser Doppler anemometer (LDA); however, instead of one interference fringe system with (nearly) parallel fringes two fringe systems - one with converging and one with diverging fringes –...
XIX IMEKO World Congress
· TC9
· 2009
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Branislav Lojko, Jan Hribik, Peter Fuchs, Miloslav Hruskovic
Accurate measurement of parameters of a power network is now possible by digital methods. The description of the proposed and realized instrument based on the digital sampling method is given. It can measure basic parameters of the three-phase power network such as rms values of voltages and currents, powers, energies, power factors, the network frequency and frequency spectra. Its accuracy is better than 0.05%. The instrument can be also used as a generator of three-phase voltage and current signals with selectable phase shifts and higher harmonic components. Questions concerning the...
XIX IMEKO World Congress
· TC4
· 2009
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Yuji Yamakawa, Takanori Yamazaki, Junichi Tamura, Osamu Tanaka
This paper clarifies the dynamic behaviors of a high speed mass measurement system with conveyor belt (a checkweigher). The objective in this study is to construct the model of the measurement system. The checkweigher with electromagnetic force compensation can be approximated by the combined spring-mass-damper systems as the physical model, and the equations of motion are derived. The model parameters can be obtained from the experimental data. Finally, the validity of the proposed model can be confirmed by comparison of the simulation results with the realistic responses. The dynamic model...
XIX IMEKO World Congress
· TC3
· 2009
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Carlo Ferrero, Angelo Chiapuzzi
In the industry, in the assembling production lines, in mass production, very often are popular special dedicated systems, so-called calibration benches , with which it is possible to ensure the correct performance and calibration of production torque tools, pneumatic, electric or electronic power tools and torque wrenches. Most important problems are encountered during the transfer of the torque unit from the accredited laboratories to the industrial laboratories. For this purpose was designed a portable calibration system named Calibration Bell , particularly dedicated to calibration of...
XIX IMEKO World Congress
· TC8
· 2009
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Yong-Gyoo Kim, Inseok Yang, Yong Shim Yoo
We have developed a blackbody block system for comparing thermocouple temperature scales realized using fixed-point and radiation methods. Platinum/palladium, type S and type B thermocouples were calibrated using the freezing points of Ag, Cu, Fe-C, Co-C, and Pd (only for Type B). The radiation thermometer used was an LP4 linear pyrometer operated at a central wavelength of 650 nm. Two scales were compared from 962 to 1544 °C, and it was found that the two scales were consistent within 0.5 °C up to 1400 °C, but the discrepancy increased to 2.0 °C at 1544 °C for the type B thermocouple. In...
XIX IMEKO World Congress
· TC12
· 2009
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Marja Mettänen, Risto Ritala
Printability of paper is a multidimensional concept consisting of runnability and print quality. The lack of definition for print quality makes printability rather ambiguous. In this paper we discuss the measurability of the high-level printability and print quality and present an interpretation of the measurements of low-level print quality related characteristics as information channels about high-level concepts. This enables the construction of a layered model in which the information provided by measurements is propagated to infer about higher level concepts of quality, eventually...
XIX IMEKO World Congress
· TC7
· 2009
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Philip Thomas, Roger Jones, James Kearns
In safety analysis as in engineering, the development of a satisfactory mathematical model is required to identify the parameters that need to be measured and calculated. The establishment of a proper calculus of safety begins with the recognition that the fundamental concept is life expectancy, and then, by extension, the increase in life expectancy that a safety measure brings about. J -value analysis, which rests on this concept, is a method of estimating how much should be spent on a new safety system to improve health and/or safety, with the amount depending on both actuarial and...
XIX IMEKO World Congress
· TC7
· 2009
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